Burr grinder



FIG. 1 is a front perspective view of a burr grinder according to our design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a back elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines in the drawing depict portions of the burr grinder that form no part of the claimed design. 

CLAIM The ornamental design for a burr grinder, as shown and described. 